Not shooting related, but when I was much younger I worked in plastics. We were tested for lead (and other heavy metals) in our blood between monthly to 6 monthly because of exposure to lead salts (these will f-you up much faster that elemental Pb). The aim was to keep us under 3 mumol/L. If anyone exceed 5 they were moved to a different line.
What I found most interesting was my levels sat about 2.5 for a long time, until I moved a line where I was working with Pb salts where it come down - because we had to wear fit tested ventilators and nitrile gloves all the time
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